Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058884
Tianheng Wang, Yuan Shen, S. Mazuelas, M. Win
The performance of wireless ranging depends on both the transmission technique and the propagation channel. Understanding such dependencies is critical to the design of high-accuracy ranging algorithms for multipath propagation environments. In this paper, we focus on orthogonal frequency-division multiplexing (OFDM) systems and derive the bounds for OFDM ranging accuracy in multipath channels based on Fisher information analysis. In particular, we obtain the equivalent Fisher information (EFI) for ranging and quantify the effects of signal and channel parameters on the ranging accuracy. We then evaluate the ranging performance through numerical examples.
{"title":"Bounds for OFDM ranging accuracy in multipath channels","authors":"Tianheng Wang, Yuan Shen, S. Mazuelas, M. Win","doi":"10.1109/ICUWB.2011.6058884","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058884","url":null,"abstract":"The performance of wireless ranging depends on both the transmission technique and the propagation channel. Understanding such dependencies is critical to the design of high-accuracy ranging algorithms for multipath propagation environments. In this paper, we focus on orthogonal frequency-division multiplexing (OFDM) systems and derive the bounds for OFDM ranging accuracy in multipath channels based on Fisher information analysis. In particular, we obtain the equivalent Fisher information (EFI) for ranging and quantify the effects of signal and channel parameters on the ranging accuracy. We then evaluate the ranging performance through numerical examples.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"92 18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130575359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058856
S. Boldrini, G. Ferrante, M. Di Benedetto
Two important functionalities in cognitive networking are network detection and recognition. Previous investigations showed that MAC sub-layer technology-specific features may offer a simple and direct way of performing such tasks; in particular, they allow to by-pass complex physical layer feature extraction based on a simple energy detection scheme, capable of producing a time-varying profile reflecting the presence vs. absence of packets over the air interface. Beyond summarizing previous experimental evidence that confirmed the validity of the approach for technologies in the ISM band, the purpose of this work is to investigate the possibility of extending the network recognition concept to underlay networks such as Ultra Wide Band. Preliminary results of experiments on UWB signals indicate that short-term energy profiles may highlight the peculiar impulsive characteristic of IEEE 802.15.4a-like signals. Continuous vs. impulsive signals may be correctly classified based on a simple but relevant feature such as short-term energy statistics. Moreover, short-term energy statistical features, as a function of increased window duration, seem to highlight a multi-static vs. continuous behavior for impulse vs. continuous-wave radio transmissions.
{"title":"UWB network recognition based on impulsiveness of energy profiles","authors":"S. Boldrini, G. Ferrante, M. Di Benedetto","doi":"10.1109/ICUWB.2011.6058856","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058856","url":null,"abstract":"Two important functionalities in cognitive networking are network detection and recognition. Previous investigations showed that MAC sub-layer technology-specific features may offer a simple and direct way of performing such tasks; in particular, they allow to by-pass complex physical layer feature extraction based on a simple energy detection scheme, capable of producing a time-varying profile reflecting the presence vs. absence of packets over the air interface. Beyond summarizing previous experimental evidence that confirmed the validity of the approach for technologies in the ISM band, the purpose of this work is to investigate the possibility of extending the network recognition concept to underlay networks such as Ultra Wide Band. Preliminary results of experiments on UWB signals indicate that short-term energy profiles may highlight the peculiar impulsive characteristic of IEEE 802.15.4a-like signals. Continuous vs. impulsive signals may be correctly classified based on a simple but relevant feature such as short-term energy statistics. Moreover, short-term energy statistical features, as a function of increased window duration, seem to highlight a multi-static vs. continuous behavior for impulse vs. continuous-wave radio transmissions.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127111837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058867
M. Başaran, S. Erkucuk, H. A. Çırpan
Ultra-wideband (UWB) multipath channels are assumed to have a sparse structure as the received consecutive pulses arrive with a considerable time delay and can be resolved individually at the receiver. Due to this sparse structure, there has been a significant amount of interest in applying the compressive sensing (CS) theory to UWB channel estimation. There are various implementations of the CS theory for the UWB channel estimation based on the assumption that the UWB channels are sparse. However, the sparsity of a UWB channel mainly depends on the channel environment. Motivated by this, in this study we investigate the effect of UWB channel environments on the CS based UWB channel estimation. Particularly, we consider the standardized IEEE 802.15.4a UWB channel models and study the channel estimation performance from a practical implementation point of view. The study shows that while UWB channel models for residential environments (e.g., CM1 and CM2) exhibit a sparse structure yielding a reasonable channel estimation performance, channel models for industrial environments (e.g., CM8) may not be treated as having a sparse structure due to multipaths arriving densely. The results of this study are important as it determines the suitability of different channel models to be used with the CS theory.
{"title":"The effect of channel models on compressed sensing based UWB channel estimation","authors":"M. Başaran, S. Erkucuk, H. A. Çırpan","doi":"10.1109/ICUWB.2011.6058867","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058867","url":null,"abstract":"Ultra-wideband (UWB) multipath channels are assumed to have a sparse structure as the received consecutive pulses arrive with a considerable time delay and can be resolved individually at the receiver. Due to this sparse structure, there has been a significant amount of interest in applying the compressive sensing (CS) theory to UWB channel estimation. There are various implementations of the CS theory for the UWB channel estimation based on the assumption that the UWB channels are sparse. However, the sparsity of a UWB channel mainly depends on the channel environment. Motivated by this, in this study we investigate the effect of UWB channel environments on the CS based UWB channel estimation. Particularly, we consider the standardized IEEE 802.15.4a UWB channel models and study the channel estimation performance from a practical implementation point of view. The study shows that while UWB channel models for residential environments (e.g., CM1 and CM2) exhibit a sparse structure yielding a reasonable channel estimation performance, channel models for industrial environments (e.g., CM8) may not be treated as having a sparse structure due to multipaths arriving densely. The results of this study are important as it determines the suitability of different channel models to be used with the CS theory.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123010833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058852
A. Somov, S. Kandeepan, A. Biswas, A. Krause
The Detect and Avoid (DAA) mechanism is a widely used technique in cognitive radios to support the coexistence of primary and secondary users operating in the same spectrum portion. In this paper we describe our experience in detecting WiMAX signal (operating as a primary user) in the 3.5 GHz range using the Ultra Wide-Band (UWB) test dongles from Wisair (operating as a possible secondary user of the spectrum). For this purpose a generic radiated test bed was prepared and two scenarios were considered in order to experimentally study the detection capability of DAA block within the WISAIR UWB devices. The detection results are presented in terms of the received signal strength and the sensitivity of the device.
DAA (Detect and Avoid)机制是一种广泛应用于认知无线电的技术，用于支持在同一频谱部分操作的主、次用户共存。在本文中，我们描述了我们使用Wisair的超宽带(UWB)测试加密狗(作为频谱的可能的辅助用户操作)在3.5 GHz范围内检测WiMAX信号(作为主要用户操作)的经验。为此，搭建了通用辐射试验台，并考虑了两种场景，实验研究了WISAIR超宽带设备内DAA块的检测能力。从接收信号强度和器件灵敏度两方面给出了检测结果。
{"title":"Detect and avoid mechanism for ultra wide-band WiMedia: Experimental evaluation of detection capabilities","authors":"A. Somov, S. Kandeepan, A. Biswas, A. Krause","doi":"10.1109/ICUWB.2011.6058852","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058852","url":null,"abstract":"The Detect and Avoid (DAA) mechanism is a widely used technique in cognitive radios to support the coexistence of primary and secondary users operating in the same spectrum portion. In this paper we describe our experience in detecting WiMAX signal (operating as a primary user) in the 3.5 GHz range using the Ultra Wide-Band (UWB) test dongles from Wisair (operating as a possible secondary user of the spectrum). For this purpose a generic radiated test bed was prepared and two scenarios were considered in order to experimentally study the detection capability of DAA block within the WISAIR UWB devices. The detection results are presented in terms of the received signal strength and the sensitivity of the device.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129330558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058854
T. Kohda, Y. Jitsumatsu, K. Aihara
Gabor-division (GD) code division multiple access (CDMA) communication, which can provide almost flat power spectrum, has been recently proposed. Using a UWB Gaussian pulse generator implemented by CMOS technology as a fundamental component generating a chip waveform, we apply the GD-CDMA system for UWB communications. Time-frequency two dimensional spread spectrum (SS) codes with Markovity are employed. How Markovian SS codes flatten the spectrum of the transmitted signal is explained.
{"title":"Markovian SS codes flatten the spectrum of UWB Gaussian pulse","authors":"T. Kohda, Y. Jitsumatsu, K. Aihara","doi":"10.1109/ICUWB.2011.6058854","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058854","url":null,"abstract":"Gabor-division (GD) code division multiple access (CDMA) communication, which can provide almost flat power spectrum, has been recently proposed. Using a UWB Gaussian pulse generator implemented by CMOS technology as a fundamental component generating a chip waveform, we apply the GD-CDMA system for UWB communications. Time-frequency two dimensional spread spectrum (SS) codes with Markovity are employed. How Markovian SS codes flatten the spectrum of the transmitted signal is explained.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"626 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123044626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058924
J. Osth, O. Owais, M. Karlsson, A. Serban, Shaofang Gong
The use of Schottky diodes as high-speed variable impedance loads in six-port modulators are proposed and analyzed in this paper. The impedance dependency of diode parameters and local oscillator power are investigated by theoretical analysis and simulations. A prototype for a direct carrier six-port modulator using Schottky diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 300 Msymbol/s is generated, i.e., at a data rate of 1.2 Gbit/s, validating the use of Schottky diodes as high-speed variable impedance loads in six-port modulators.
{"title":"Schottky diode as high-speed variable impedance load in six-port modulators","authors":"J. Osth, O. Owais, M. Karlsson, A. Serban, Shaofang Gong","doi":"10.1109/ICUWB.2011.6058924","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058924","url":null,"abstract":"The use of Schottky diodes as high-speed variable impedance loads in six-port modulators are proposed and analyzed in this paper. The impedance dependency of diode parameters and local oscillator power are investigated by theoretical analysis and simulations. A prototype for a direct carrier six-port modulator using Schottky diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 300 Msymbol/s is generated, i.e., at a data rate of 1.2 Gbit/s, validating the use of Schottky diodes as high-speed variable impedance loads in six-port modulators.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115184608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058864
A. Barbieri, F. Pancaldi, G. Vitetta
In this paper compressed sensing (CS) techniques are employed to develop reduced sampling rate strategies for channel estimation and data detection in impulse radio ultrawideband (IR-UWB) systems. In particular, first channel estimation algorithms based on Matching Pursuit (MP) and Basis Pursuit Denoising (BPDN) techniques are proposed. Then, it is shown how the channel estimates generated by these algorithms can be used in correlation-based CS detectors. Finally, the performance loss originating from CS is assessed analytically in a transmitted reference (TR) system.
{"title":"Compressed channel estimation and data detection algorithms for IR-UWB","authors":"A. Barbieri, F. Pancaldi, G. Vitetta","doi":"10.1109/ICUWB.2011.6058864","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058864","url":null,"abstract":"In this paper compressed sensing (CS) techniques are employed to develop reduced sampling rate strategies for channel estimation and data detection in impulse radio ultrawideband (IR-UWB) systems. In particular, first channel estimation algorithms based on Matching Pursuit (MP) and Basis Pursuit Denoising (BPDN) techniques are proposed. Then, it is shown how the channel estimates generated by these algorithms can be used in correlation-based CS detectors. Finally, the performance loss originating from CS is assessed analytically in a transmitted reference (TR) system.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114413119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058909
Ahmed Benfarah, B. Miscopein, J. Gorce
Jamming is a major threat against wireless communications. In this paper, we evaluate the effect of jamming on an UWB link employing a PPM non-coherent receiver. We optimize the jammer parameters that are the central frequency and the bandwidth based on the metric of the signal-to-jamming ratio. The optimization depends on different system parameters such as the channel model and the integration time of the receiver.
{"title":"Optimizing jammer model against PPM UWB non-coherent receiver","authors":"Ahmed Benfarah, B. Miscopein, J. Gorce","doi":"10.1109/ICUWB.2011.6058909","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058909","url":null,"abstract":"Jamming is a major threat against wireless communications. In this paper, we evaluate the effect of jamming on an UWB link employing a PPM non-coherent receiver. We optimize the jammer parameters that are the central frequency and the bandwidth based on the metric of the signal-to-jamming ratio. The optimization depends on different system parameters such as the channel model and the integration time of the receiver.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114482668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058902
Navin Agarwal, R. Bhattacharjee, R. Jana
The prediction of the reflection and transmission phenomenon is important for modeling the indoor ultra wideband (UWB) communication environment. This paper develops an approach to analyze the reflection and transmission of UWB signals considering successive reflections inside a finite thickness building wall modeled as a lossy dielectric slab. The UWB signal source is modeled as a point source and when such a source transmits in an indoor environment, the waves impinge on the walls at different angles at different distances. The main objective of this work is to provide an analytical approach for obtaining the arriving angles at the interface of the wall and determine the reflected and transmitted signals taking the effect of the wall into consideration. The properties of the received UWB signal are investigated for different thickness and electrical parameters of the wall.
{"title":"Modeling of reflection and transmission of signal through building wall for a point source UWB transmitter","authors":"Navin Agarwal, R. Bhattacharjee, R. Jana","doi":"10.1109/ICUWB.2011.6058902","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058902","url":null,"abstract":"The prediction of the reflection and transmission phenomenon is important for modeling the indoor ultra wideband (UWB) communication environment. This paper develops an approach to analyze the reflection and transmission of UWB signals considering successive reflections inside a finite thickness building wall modeled as a lossy dielectric slab. The UWB signal source is modeled as a point source and when such a source transmits in an indoor environment, the waves impinge on the walls at different angles at different distances. The main objective of this work is to provide an analytical approach for obtaining the arriving angles at the interface of the wall and determine the reflected and transmitted signals taking the effect of the wall into consideration. The properties of the received UWB signal are investigated for different thickness and electrical parameters of the wall.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115083838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-10-24DOI: 10.1109/ICUWB.2011.6058921
Fabio Versolatto, A. Tonello, M. Girotto, C. Tornelli
We consider the deployment of impulsive ultra wide band (I-UWB) modulation for power line communications (PLC) on medium voltage (MV) networks. We firstly describe several receiver structures, and practical channel detection algorithms based on a data-aided approach. The joint estimation of the channel response and the noise correlation is also considered. Then, we address the system performance on real MV channels. The channels have been measured in a real MV test network. Results are provided in terms of bit error rate, with a power spectral density constraint.
{"title":"Performance of practical receiver schemes for impulsive UWB modulation on a real MV power line network","authors":"Fabio Versolatto, A. Tonello, M. Girotto, C. Tornelli","doi":"10.1109/ICUWB.2011.6058921","DOIUrl":"https://doi.org/10.1109/ICUWB.2011.6058921","url":null,"abstract":"We consider the deployment of impulsive ultra wide band (I-UWB) modulation for power line communications (PLC) on medium voltage (MV) networks. We firstly describe several receiver structures, and practical channel detection algorithms based on a data-aided approach. The joint estimation of the channel response and the noise correlation is also considered. Then, we address the system performance on real MV channels. The channels have been measured in a real MV test network. Results are provided in terms of bit error rate, with a power spectral density constraint.","PeriodicalId":143107,"journal":{"name":"2011 IEEE International Conference on Ultra-Wideband (ICUWB)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115415166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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